Development of novel antibacterial agents against methicillin-resistant Staphylococcus aureus
摘要:
Methicillin-resistant Staphylococcus aureus (MRSA) poses a serious threat to public health because of its resistance to multiple antibiotics most commonly used to treat infection. In this study, we report the unique ability of the cyclooxygenase-2 (COX-2) inhibitor celecoxib to kill Staphylococcus aureus and MRSA with modest potency. We hypothesize that the anti-Staphylococcus activity of celecoxib could be pharmacologically exploited to develop novel anti-MRSA agents with a distinct mechanism. Examination of an in-house, celecoxib-based focused compound library in conjunction with structural modifications led to the identification of compound 46 as the lead agent with high antibacterial potency against a panel of Staphylococcus pathogens and different strains of MRSA. Moreover, this killing effect is bacteria-specific, as human cancer cells are resistant to 46. In addition, a single intraperitoneal administration of compound 46 at 30 mg/kg improved the survival of MRSA-infected C57BL/6 mice. In light of its high potency in eradicating MRSA in vitro and its in vivo activity, compound 46 and its analogues warrant continued preclinical development as a potential therapeutic intervention against MRSA. (C) 2012 Elsevier Ltd. All rights reserved.
First synthesis of functionalized 5-aryl-3-(trifluoromethyl)phenols by regioselective [3+3] cyclocondensations of 1,3-bis(silyloxy)-1,3-butadienes with 3-aryl-3-silyloxy-1-trifluoromethyl-2-en-1-ones
A variety of functionalized 5-aryl-3-(trifluoromethyl)phenols were prepared by the first TiCl4-mediated [3+3] cyclocondensation of 1,3-bis(trimethylsilyloxy)-1,3-butadienes with 3-aryl-3-trimethylsilyloxy-1-trifluoromethyl-2-en-1-ones.
One-pot synthesis of difluoromethyl ketones by a difluorination/fragmentation process
作者:Daniel J. Leng、Conor M. Black、Graham Pattison
DOI:10.1039/c5ob02468d
日期:——
Difluoromethyl ketones are an under-studied class of ketones which have great potential as useful building blocks for materials and drug design.
二氟甲基酮是一类研究不足的酮类化合物,具有作为材料和药物设计的有用构建块的巨大潜力。
A Sequential Route to Cyclopentenes from 1,6-Enynes and Diazo Ketones through Gold and Rhodium Catalysis
作者:Balaji S. Kale、Hsin-Fu Lee、Rai-Shung Liu
DOI:10.1002/adsc.201600980
日期:2017.2.2
aryl diazo ketones through two new reaction sequences involving initial gold‐catalyzedcyclization of 1,6‐enynes with diazo species, followed by rhodium‐catalyzed skeletal rearrangement of the resulting 3‐cyclopropyl‐2‐en‐1‐ones. In most instances the rhodium‐catalyzed reactions afforded cyclopentene derivatives whereas several n‐alkyl‐ or ortho‐substituted phenyl ketones delivered seven‐membered oxacycles
[EN] A CONTINUOUS FLOW MICRO-TOTAL PROCESS SYSTEM FOR PREPARATION OF CELECOXIB AND ANALOGS THEREOF<br/>[FR] MICRO-SYSTÈME DE TRAITEMENT TOTAL À FLUX CONTINU POUR LA PRÉPARATION DU CÉLÉCOXIB ET D'ANALOGUES DE CELUI-CI
申请人:COUNCIL SCIENT IND RES
公开号:WO2020157771A1
公开(公告)日:2020-08-06
The present invention relates to preparation of pyrazoles. This invention further relates to a continuous flow micro-total process system for preparation of celecoxib, a COX-2 selective non-steroidal anti-inflammatory drug, and analogs thereof.
Fluorotrifluoromethyl Group Installation: Tetrasubstituted Tertiary Stereocenters Containing C–F and C–CF<sub>3</sub> Bonds via Copper-Mediated Allylic Substitution
作者:Yingling Zhang、Nils Raugh、Ulrich Koert
DOI:10.1021/acs.orglett.3c02032
日期:2023.8.4
obtained from secondary 3-fluoro-3-trifluoromethyl allylicphosphates by a copper(I)-mediated allylic substitution reaction usingGrignardreagents. The reaction features a broad substrate scope, high γ-regioselectivity, and excellent (E)-stereoselectivity. Two examples of chirality transfer from enantiopure secondary fluorine-substituted allylicphosphates to the corresponding scalemic products indicate
含有氟三氟甲基 (FTF) 基序的四取代三级中心是通过使用格氏试剂的铜 (I) 介导的烯丙基取代反应从仲 3-氟-3-三氟甲基烯丙基磷酸酯获得的。该反应具有广泛的底物范围、高γ-区域选择性和优异的( E )-立体选择性。从对映体纯仲氟取代的烯丙基磷酸酯到相应的鳞片产物的手性转移的两个例子表明了安装 FTF 立体中心的方法的立体选择性潜力。